The impact of reservoir construction on riverine sediment and carbon fluxes to the Mediterranean Sea
18 pages, 8 figures, 4 tables
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Elsevier
2018-04
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| Subjects: | Particulate organic carbon, Suspended sediment fluxes, Mediterranean rivers, Modeling, Reservoirs, |
| Online Access: | http://hdl.handle.net/10261/167121 http://dx.doi.org/10.13039/501100004794 |
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dig-icm-es-10261-1671212020-12-10T07:39:57Z The impact of reservoir construction on riverine sediment and carbon fluxes to the Mediterranean Sea Sadaoui, Mahrez Ludwig, Wolfgang Bourrin, F. Romero, Estela Centre National de la Recherche Scientifique (France) Particulate organic carbon Suspended sediment fluxes Mediterranean rivers Modeling Reservoirs 18 pages, 8 figures, 4 tables Riverine suspended particulate matter (SPM) is an important vector for the transfer of nutrients and contaminants to the Sea. Mediterranean rivers are naturally rich in SPM, but their fluxes have been largely altered in the past decades because of damming. Based on empirical modeling, combining literature estimates on SPM fluxes with the environmental characteristics of the corresponding drainage basins, we present for the first time a spatially explicit quantification of the natural fluxes at the level of the Mediterranean Sea and its different sub-basins. These fluxes are further combined with the evolution of major reservoir constructions during the last century in order to quantify the sediment retention by dams. Our results confirm that natural riverine sediment fluxes generally result from a combination of hydroclimatic, geomorphologic and land use parameters in the corresponding drainage basin. Among these factors, the combination of lithology and land elevation appears to be a key factor in the control of mechanical erosion rates. According to our model, the natural flux of SPM by all Mediterranean rivers cumulates to about 997 Mt yr, which corresponds to a specific SPM flux of 211 t km yr. Besides the Nile River, which holds a particular place among the Mediterranean rivers, coastal rivers (<5000 km) are particularly important for the overall SPM transport. Although they only occupy 38% of the Mediterranean drainage basin area, they export about 58% of the natural SPM flux. We further quantified the potential impact of damming on these fluxes. Using the dams which are geolocalized in the global GRandD data base, and combining them with a high resolution (5′) river routing scheme developed in this study, we find that after 2003, about 35% of the river sediments are retained by dams (26% without the Nile). These values are clearly minimum values, since GRandD is far from being complete in the Mediterranean drainage basin. According to our simulations, about 22% of the storage capacity is currently lost in these dams, and about 30% of them have a life expectancy that does not exceed 200 years. We finally also combined our modeling with a global model for the fluxes of particulate organic carbon (POC), representative for particulate organic nutrients in general. Although POC is non-linearly coupled to the fluxes of SPM, our results show that the retention of POC in dams is almost identical to the retention of sediments This work was supported by the National Centre of Scientific Research (Centre national de la recherche scientifique, CNRS) through attribution of a PhD grant to MS, and by the LOICZ international project and MERMEX project under the MISTRALS program Peer Reviewed 2018-06-28T07:01:13Z 2018-06-28T07:01:13Z 2018-04 2018-06-28T07:01:13Z artículo http://purl.org/coar/resource_type/c_6501 doi: 10.1016/j.pocean.2017.08.003 issn: 0079-6611 Progress in Oceanography 163: 94-111 (2018) http://hdl.handle.net/10261/167121 10.1016/j.pocean.2017.08.003 http://dx.doi.org/10.13039/501100004794 https://doi.org/10.1016/j.pocean.2017.08.003 Sí none Elsevier |
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Particulate organic carbon Suspended sediment fluxes Mediterranean rivers Modeling Reservoirs Particulate organic carbon Suspended sediment fluxes Mediterranean rivers Modeling Reservoirs |
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Particulate organic carbon Suspended sediment fluxes Mediterranean rivers Modeling Reservoirs Particulate organic carbon Suspended sediment fluxes Mediterranean rivers Modeling Reservoirs Sadaoui, Mahrez Ludwig, Wolfgang Bourrin, F. Romero, Estela The impact of reservoir construction on riverine sediment and carbon fluxes to the Mediterranean Sea |
| description |
18 pages, 8 figures, 4 tables |
| author2 |
Centre National de la Recherche Scientifique (France) |
| author_facet |
Centre National de la Recherche Scientifique (France) Sadaoui, Mahrez Ludwig, Wolfgang Bourrin, F. Romero, Estela |
| format |
artículo |
| topic_facet |
Particulate organic carbon Suspended sediment fluxes Mediterranean rivers Modeling Reservoirs |
| author |
Sadaoui, Mahrez Ludwig, Wolfgang Bourrin, F. Romero, Estela |
| author_sort |
Sadaoui, Mahrez |
| title |
The impact of reservoir construction on riverine sediment and carbon fluxes to the Mediterranean Sea |
| title_short |
The impact of reservoir construction on riverine sediment and carbon fluxes to the Mediterranean Sea |
| title_full |
The impact of reservoir construction on riverine sediment and carbon fluxes to the Mediterranean Sea |
| title_fullStr |
The impact of reservoir construction on riverine sediment and carbon fluxes to the Mediterranean Sea |
| title_full_unstemmed |
The impact of reservoir construction on riverine sediment and carbon fluxes to the Mediterranean Sea |
| title_sort |
impact of reservoir construction on riverine sediment and carbon fluxes to the mediterranean sea |
| publisher |
Elsevier |
| publishDate |
2018-04 |
| url |
http://hdl.handle.net/10261/167121 http://dx.doi.org/10.13039/501100004794 |
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